"""
字符串
"""
a=15
b=12345678.1234567
s='I love python!'
print('a=%05d' % a)
print('b=%8.3f' % b)
print('%17s' % s)
print('%-17.6s' % s)



import time
scale=10
print('----------执行开始----------')
for i in range(scale + 1):
    done='**' * i
    undone='..' *(scale - i)
    percent=i / scale
    #格式化输出
    print('{:>4.0%}[{}->{}]'.format(percent, done, undone))
    time.sleep(0.1)
print('----------执行结束----------')



strs = 'rain falls on field and tree.'
print(strs)
split_strs = strs.split()
print(split_strs)
join_strs = ''.join(split_strs)
print(join_strs)



